About 3 months ago my right airpod(2ndgen) just decided to not work correctly and sounded like it was playing out the back and they were only about 6 months old, the warranty for whatever reason was a bit messed up so i had to get that sorted and once i did they were taken to my nearest apple store and apparently both AirPods "failed" whatever test they do to them and they just replaced both. I didn't notice anything wrong with the left but hey brand new ones and I haven't had any issues since